Alert archive / Missouri / Mesoscale Discussions in 2011
Mesoscale Discussion 186
The Storm Prediction Center issued this mesoscale discussion at Mar 4, 2011, 6:22 PM CST for 4 counties in Arkansas; 11 counties in Illinois; 21 counties in Missouri. It was in force for 53 min.
The area
The outline as issued.
The facts
- Issued
- Mar 4, 2011, 6:22 PM CST (00:22 UTC)
- Expired
- Mar 4, 2011, 7:15 PM CST
- In force
- 53 min
- Issued by
- the Storm Prediction Center
All 36 counties
Baxter County, AR, Boone County, AR, Fulton County, AR, Marion County, AR, Clinton County, IL, Fayette County, IL, Franklin County, IL, Jackson County, IL, Jefferson County, IL, Marion County, IL, Monroe County, IL, Perry County, IL, Randolph County, IL, Saint Clair County, IL, Washington County, IL, Bollinger County, MO, Cape Girardeau County, MO, Carter County, MO, Dent County, MO, Douglas County, MO, Howell County, MO, Iron County, MO, Jefferson County, MO, Madison County, MO, Oregon County, MO, Ozark County, MO, Perry County, MO, Reynolds County, MO, Ripley County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Shannon County, MO, Taney County, MO, Texas County, MO, Washington County, MO, Wayne County, MO
The radar
The St Louis radar (KLSX), 156 km from the middle of the area, began a volume at 00:23 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Springfield, MO (KSGF), launched 00:00Z, 0.4 hours before the alert went out and 241 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 284 J/kg
- Mixed-layer CIN
- -42 J/kg
- Mixed-layer LCL
- 571 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 14 m²/s²
- 0-3 km storm-relative helicity
- 134 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 2.0
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 4, 6:50 PM CST | Severe Thunderstorm Watch | SPC | Baxter, Benton, Boone, Carroll, Cleburne, Conway and 23 more | 7 hr |
| Mar 4, 10:48 PM CST | Mesoscale Discussion | SPC | Clay, Cleburne, Independence, Jackson, Lawrence, Randolph and 2 more | 87 min |
Nearby
Mesoscale Discussions in Missouri, 2011Mesoscale Discussions in Illinois, 2011Mesoscale Discussions in Arkansas, 2011Every mesoscale discussion in 2011
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.